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How does having a dynamic variable affect performance?
...see if it is anything special. Maybe it is a legacy COM object, or an Iron Python object, or an Iron Ruby object, or an IE DOM object. If it is not any of those then it must be an ordinary C# object.
This is the point where the compiler starts up again. There's no need for a lexer or parser, so the...
When to Redis? When to MongoDB? [closed]
... are similar in structure to XML and YAML files, and to dictionaries as in Python, so think of your data in that sort of hierarchy. When indexing, the structure is the key: A document contains named keys, which contain either further documents, arrays, or scalar values. Consider the below documen...
When is the thread pool used?
...re's no such function to call to simulate something like time.sleep(30) in python, for example. There's setTimeout but that is fundamentally NOT sleep. setTimeout and setInterval explicitly release, not block, the event loop so other bits of code can execute on the main execution thread. The only th...
What is the best way to compute trending topics or tags?
...ng for. To give you an idea of simple this can be to implement, here is a python implementation (minus all the database interaction):
>>> class EMA(object):
... def __init__(self, base, decay):
... self.val = base
... self.decay = decay
... print self.val
... def update(self, valu...
How to create a video from images with FFmpeg?
...
If you are using python and subprocess.call to start ffmpeg, you should not use the single quotes 'in the input and output file names. Otherwise it will not find the files.
– RunOrVeith
May 13 '19 at 12:...
What techniques can be used to speed up C++ compilation times?
...u can run the regular nm command and pipe it to your favorite script (AWK, Python, etc.) to sort the symbols based on their length. Based on our experience, this method identifies the largest trouble making candidates better than method 1.
Method 3 - Use Templight
"Templight is a Clang-based tool to...
Regex Pattern to Match, Excluding when… / Except between
...r example, as well as the still-experimental regex module to replace re in Python, are the only two engines I know that support infinite-width lookbehind. With these tools, one condition in one lookbehind can take care of looking not only behind but also at the match and beyond the match, avoiding t...
When to use volatile with multi threading?
...ntations worked and was never guaranteed by any standard.
For example the Linux kernel still uses its own hand-rolled atomics with volatile, but only supports a few specific C implementations (GNU C, clang, and maybe ICC). Partly that's because of GNU C extensions and inline asm syntax and semanti...
How do I achieve the theoretical maximum of 4 FLOPs per cycle?
...ed by CPU throttling.
2 x Intel Xeon X5482 Harpertown @ 3.2 GHz
Ubuntu Linux 10 x64
GCC 4.5.2 x64 - (-O2 -msse3 -fopenmp)
Threads: 1
Seconds = 78.3357
FP Ops = 960000000000
FLOPs = 1.22549e+10
sum = 2.22652
Theoretical SSE Peak: 4 flops * 3.2 GHz = 12.8 GFlops. Actual is 12.3 GFlops.
Th...
What are the barriers to understanding pointers and what can be done to overcome them? [closed]
...ement a simple bytecode based virtual machine (in any language they chose, python works great for this) with an instruction set focussed on pointer operations (load, store, direct/indirect addressing). Then ask them to write simple programs for that instruction set.
Anything requiring slightly more...